地下水資源整體營運規劃與綜合評估(II)

Abstract

目前由於「台灣地區地下水觀測網整體計畫」的執行，對於濁水溪沖積扇、屏東平原、嘉南平原與蘭陽平原，已有較完整之地下水觀測資料，部份地區亦曾有地下水管理相關之研究，惟其大多注重於地下水系統的瞭解及數值方法之應用，並未進一步結合系統分析的方法，將整個地表與地下視為完整的系統進行整體的分析。爰此，本計畫擬整合系統分析與數值模擬方法，針對所選定地下水區之地下水資源可利用量、投資成本及地下水管理策略等，結合地表水系統進行整體營運規劃與綜合評估。本計畫將分兩年進行，第一年主要工作為地下水資源現況整體檢討、發展單目標地表地下最佳潛能模式及案例分析、初步規劃發展多目標地表地下最佳潛能模式及初擬地下水最佳利用分區。第二年主要工作為發展多目標地表地下最佳潛能模式及多目標最佳營運規劃及案例應用分析; 最後本計畫的成果將可提供決策者如地下水分區管理策略、整體可開發潛能與投資成本之競爭關係及階段性開發合理規模等資訊，以提供地層下陷防治及地下水資源整體經營之參考，發揮地下水觀測站網最大加值效益。

Efforts to renovate the regional groundwater monitoring network have yielded large amount of hydro-geological data for the Cho-Shui River fan, Ping-Tung Plain, Chia-Nan Plain and Iee-Lang Plain in Taiwan. Groundwater management-related research has progressed along with duration of the project. Whereas most studies have focused on more thoroughly understanding the groundwater system and developing a numerical model for the target aquifers, the surface and subsurface water have rarely been considered as a unified system. Moreover, to our knowledge, the system analysis method has never been systematically applied to analyze the groundwater management problem. Therefore, this project will integrate the system analysis method with numerical simulation to evaluate groundwater resources, assess development costs and recommend management policies under the conjunctive use of a surface water system. The project will require two years to reach completion. The first year will assess the groundwater resources, develop a single-objective optimization model for conjunctive use of surface and sub-surface water, and conduct a pilot study of optimal zoning for groundwater development. The second year of the project will develop a multi-objective planning model for the conjunctive use of surface and sub-surface water and, then, apply that model to the target area. Results of this project will provide the decision maker with available groundwater resources for the target areas, an optimal strategy for the regional groundwater management and a tradeoff between the investment cost and the potential system yield under the framework of conjunctive management of surface and sub-surface water.